Lab tests CPT 84100 Inpatient — admitted to hospital

Phosphorus test cost in Memphis, TN — inpatient

In Memphis, TN-MS-AR, 12 hospitals list a cash price for phosphorus (phosphate) blood test as an inpatient: from $5.06 to $48.48, with a median of $21.75. The lowest listed price is at Methodist Lebonheur Childrens Hosp — $16.69 less than the median here. Across Tennessee, the median is $31.17 at 88 hospitals.

Cash prices at 12 facilities across 7 cities for code 84100, as an inpatient (admitted to hospital) . Collected Sep 27, 2026; the hospital files themselves were last updated between Feb 27, 2026 and Feb 28, 2026.

Lowest$5.06Methodist Lebonheur Childrens Hosp
Median$21.75half of hospitals charge less
Highest$48.48in this market
Difference9.6×highest vs lowest

Where each hospital's price falls

Each dot is one hospital's cash price on a scale from the lowest to the highest in Memphis, TN-MS-AR.

median
Lowest $5.06Highest $48.48

Hospitals, cheapest first

HospitalCash priceList priceInsurers payOff list
Methodist Lebonheur Childrens Hosp lowest Memphis, TN HC Assay of Inorganic Phosphorus - Phosphorus Body Fluid source file $5.06 $23.00 — 78%
Methodist Lebonheur Childrens Hosp Memphis, TN HC Assay of Inorganic Phosphorus - Phosphorus source file $6.60 $30.00 — 78%
Methodist South Hospital Memphis, TN · (901) 516-8274 HC Assay of Inorganic Phosphorus - Phosphorus source file $13.20 $60.00 $1.99–$32.70 78%
Methodist University Hospital Memphis, TN · (901) 516-8274 HC Assay of Inorganic Phosphorus - Phosphorus source file $13.20 $60.00 $1.99–$32.70 78%
Methodist Olive Branch Hospital Olive Branch, MS · (662) 932-9000 HC Assay of Inorganic Phosphorus - Phosphorus source file $13.20 $60.00 $1.99–$32.70 78%
Methodist North Hospital Memphis, TN · (901) 516-8274 HC Assay of Inorganic Phosphorus - Phosphorus source file $13.20 $60.00 $1.99–$32.70 78%
Methodist Le Bonheur Germantown Hospital Germantown, TN · (901) 516-8274 HC Assay of Inorganic Phosphorus - Phosphorus source file $13.20 $60.00 $1.99–$32.70 78%
Baptist Memorial Hospital-Crittenden West Memphis, AR · (870) 394-7800 PHOSPHORUS LEVEL File of Feb 27, 2026 · source file $30.30 $202.00 $76.76–$161.60 85%
Baptist Memorial Hospital-DeSoto Southaven, MS · (662) 772-4000 PHOSPHORUS LEVEL File of Feb 27, 2026 · source file $40.40 $202.00 $76.76–$181.80 80%
Baptist Memorial Hospital-Memphis Memphis, TN · (901) 226-5000 PHOSPHORUS LEVEL File of Feb 28, 2026 · source file $42.42 $202.00 $76.76–$181.80 79%
Baptist Memorial Hospital-Women's Memphis, TN PHOSPHORUS LEVEL File of Feb 27, 2026 · source file $42.42 $202.00 $76.76–$181.80 79%
Baptist Memorial Hospital-Collierville Collierville, TN · (901) 226-5000 PHOSPHORUS LEVEL File of Feb 27, 2026 · source file $42.42 $202.00 $76.76–$181.80 79%
Baptist Memorial Hospital-Tipton Covington, TN · (901) 476-2621 PHOSPHORUS LEVEL File of Feb 27, 2026 · source file $48.48 $202.00 $76.76–$181.80 76%
Hospital The hospital that published the price, its city and the line exactly as written in its price file.
Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More
List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More
Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More
Off list How much lower the cash price is than the list price.

Inpatient: lowest $5.06, median $21.75, highest $48.48 — a 9.6× difference within the same market.

As an outpatient, the same code is billed by 13 facilities here, median $30.30 — that is the price to compare if you are not being admitted.

Cash or insurance?

At 11 of 11 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 6 it is below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.

What it is

A phosphorus test measures phosphate in the blood. It is used with calcium for kidney disease, bone disease and parathyroid problems.

What the price covers

The price usually covers running the test. The blood draw (36415) is often billed as a separate line.